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(a) Optical microscope image of polymeric microcapsules (HPs) in oil phase, (b–d) fluorescence microscope images of HPs in water-in-oil solution, showing (b) green and (c) red fluorescence derived from encapsulating fluorescein isothiocyanate labeled dextran (FITC-Dextran, MW 500 kDa) and Au NCs, respectively; (d) the overlapping image of (b,c); and SEM showing a hollow (e) and stabilized structure (f) of HPs. Scale bars in (a–d) are 50 μm, (e,f) are 20 μm and 2 μm, respectively.
